In the management literature, it has been widely known that the extent of knowledge sharing across organization is critically contributing to the firm`s sustainable competitiveness. In reality, it is true that a certain degree of personal reluctance to share knowledge exists among employees. Therefore, reducing the reluctance against knowledge sharing among organization members poses a serious research issue. Intention about knowledge sharing is usually hindered by in-group rivalries. Also employees feel negative in sharing their knowledge with colleagues when they expect to receive little support and recognition in return after doing that. The main purpose of this study is to investigate why people voluntarily is willing to share their knowledge with others in the competitive context where potential rivalry is still expected, In answering this research question, we tried to find out the positive and negative emotional factors affecting individuals` intention about knowledge sharing. For the sake of empirical analyses, 258 valid questionnaires were garnered from online community where a number of people has been actively interacting with registered members to share crucial knowledge about sensitive issues. Results revealed that the proposed research hypotheses are adequately proved with significant statistical results.